Benefit and cost analysis of hydrological forecasts

In section 1.1 are enumerated reasons for establishing a HFS for different purposes, specified in section 1.4. Indeed the best reason for the establishment of such systems, particularly in developing countries, are examples of their benefits derived either in developed, industrialized countries or in neighbouring developing countries with similar climatic conditions. It should however be noted, that the benefits are not always the same and thus in a more careful analysis, during periods of national financial stringencies, the question will necessarily arise, if an HFS is an endeavour worth the investment. In the case of specific climatic conditions, such as those existing in regions subjected to tropical cyclones (typhoons, hurricanes), the justification of establishment of flood forecasting systems needs hardly a substantiation. Indeed the consideration of the following numbers will probably be sufficient.